WARNING SYSTEMS !! (seismometers and computers monitor Earth tremors or change in water levels.
Authorities inform residents through public broadcasts or through sirens of impending danger so they can begin the mass evacuation.
Scientists in Haicheng, China identified changes in ground level and increase in small tremors (signs of an impending earthquake).
Authorities informed the people and warned them to EVACUATE the city.
This resulted in 90, 000 people being saved from the 7.3 magnitude earthquake which destroyed 90% of the city's infrastructure.
Authorities inform residents through public broadcasts or through sirens of impending danger so they can begin the mass evacuation.
Scientists in Haicheng, China identified changes in ground level and increase in small tremors (signs of an impending earthquake).
Authorities informed the people and warned them to EVACUATE the city.
This resulted in 90, 000 people being saved from the 7.3 magnitude earthquake which destroyed 90% of the city's infrastructure.